Variations in Olfactory Parameters in Different Olfactory Disorders: A Retrospective study

AIM OF THE STUDY: The aim of this study is to analyse the variations in n-butanol threshold and odour identification scores of the CCCRC test (Connecticut Chemosensory Clinical Research Centre) in patients with various olfactory disorders. STUDY DESIGN: This was a retrospective observational cohort study. MATERIALS AND METHODS: Patients for this study were recruited retrospectively from CMC database. All patients who were diagnosed with olfactory dysfunction, between January 2018 and March 2020, based on CCCRC olfaction testing were selected retrospectively after applying the inclusion and exclusion criteria. After patient selection, details of each patient including demography, presenting symptoms, duration of symptoms, clinical examination and olfaction testing details were recorded and analysed. RESULTS AND CONCLUSION: At the end of the study, the n-butanol threshold scores and the odour identification scores were analysed for variations in each type of the olfactory dysfunction, comorbidities and nasal diseases. We found that the odour identification component of the CCCRC test plays a major role in determining the composite score and thereby the type of olfactory dysfunction. Among the seven odours tested for odour identification, pepper was the most affected smell among most of the nasal diseases and comorbidity groups